Amino acids by a regulated method or by simple non-derivatized method with carbohydrates or not?

[The_Ion_Lady]

🤔Well, we can go with the old fashion but regulated way as discussed in this case study:

EP Amino Acid Analysis 2.2.56, Method 1 - Post-Column with Ninhydrin Derivatization 

or simply by HPAE-PAD with no derivatization:

Combined AAA with carbohydrates by HPAE-PAD method 

Which one would you rather use & why?